Fuck that stock gauge. It's inaccurate and unreliable at best.
Go buy yourself a quality (about $50) mechanical boost gauge. That is a gauge that has no sending unit, you just connect a vacuum line straight to the back of the gauge.
If you still only register 1psi with a mechanical gauge, and you say you have no vacuum/boost leaks, then your turbo might be shiting a brick in the near future.
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